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Doubles in session


Current system
17335+5734
MLR 571
HD 159870


Nearby doubles
19' : 17323+5718
LDS1449

29' : 17301+5743
ES 1742

41' : 17319+5655
ES 2659

54' : 17285+5657
ES 1741

55' : 17328+5639
SLN 37

56' : 17400+5747
MLR 572

56' : 17270+5718
ES 2658

63' : 17373+5640
STI2354

79' : 17432+5744
STI2355

81' : 17258+5643
RAO 370

84' : 17433+5703
LDS1450

92' : 17267+5621
A 1151

93' : 17325+5905
GRV1151

96' : 17279+5610
A 1152

99' : 17444+5819
LDS1451

106' : 17437+5842
CRB 201

107' : 17398+5908
ARG 103

107' : 17436+5844
ALP 24

109' : 17337+5545
GRV1152

109' : 17235+5623
LDS4741

110' : 17220+5638
ES 2657AB

111' : 17327+5924
MLR 355

116' : 17386+5546
STF2199

117' : 17211+5637
LDS1444

120' : 17480+5707
MLB1077AB

126' : 17195+5832
KR 46



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Binary Systems
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Quadruple Systems
Multiple Systems
Neglected List I
Neglected List II
Observed
Herschel, W.
Herschel, J.F.W.
Struve, Otto
Struve, F.G.W.

17335+5734 MLR 571 (HD 159870)

 
 
17h 33m 31.60s +57° 33' 31.4" P.A. 330.00 sep 0.1 mag 7.23,6.87 Sp A5V+G5III dist. 250 pc (815.5 l.y.)
 
 
Coord 2000 17335+5734 Discov num MLR 571 Comp Coord arcsec 2000 17 33 31.60 +57 33 31.4
Date first 1979 Date last 2011 Obs 42
Pa first 10 Pa last 330.1 P.A. Now (θ) 66.3°
Sep first 0.2 Sep last 0.059 Sep. Now (ρ) 0.13"
Mag pri 7.23 Mag sec 6.87 delta mag (ΔM) 0.36 Spectral class A5V+G5III (white/yellow)
Pri motion ra +001 Sec motion ra
Pri motion dec +004 Sec motion dec
Notes N O (See Notes, Orbital solution)
This double is physical.
 
 
OTHER CATALOGS AND DESIGNATIONS
 
 
Name HD 159870 Constellation Draco SAO 30464 HIP 85923
Tycho2 3897-01058-1 Gaia DR2 1422359405973750784 HD 159870 HR 6560
GC 23838 BD BD+57 1780 Distance 250 Distance ly 815.5
 
 
ORBITAL ELEMENTS
 
 
Period (P)71.15y Periastron (T)2007.05y Semi-major axis (a)0.128a
Eccentricity (e)0.374 Inclination (i)144.1° Longitude of periastron (ω)0.7°
Node (Ω)203.1° Notesn ReferenceGrf2013d
Equinox2000 Last observation2009 Grade3(1=Definitive, 9=Indet.)
label theta rho
2000 271.1 0.082
2001 261.7 0.081
2002 252.0 0.080
2003 242.1 0.079
2004 232.3 0.080
2005 222.5 0.080
2006 212.7 0.080
2007 203.0 0.080
2008 193.3 0.080
2009 183.5 0.080
2010 173.6 0.079
2011 163.7 0.079
2012 153.7 0.079
2013 143.9 0.080
2014 134.4 0.082
2015 125.3 0.084
2016 116.8 0.087
2017 108.9 0.091
2018 101.7 0.095
2019 95.1 0.100
2020 89.2 0.105
2021 83.7 0.110
2022 78.8 0.115
2023 74.3 0.120
2024 70.1 0.125
2025 66.3 0.130
2026 62.7 0.135
2027 59.4 0.139
2028 56.3 0.144
2029 53.4 0.148
2030 50.6 0.152
2031 48.0 0.155
2032 45.4 0.159
2033 43.0 0.162
2034 40.7 0.165
2035 38.4 0.167
2036 36.2 0.169
2037 34.1 0.171
2038 32.0 0.173
2039 29.9 0.174
2040 27.8 0.175
2041 25.8 0.176
2042 23.8 0.176
2043 21.8 0.176
2044 19.8 0.176
2045 17.7 0.175
2046 15.7 0.174
2047 13.6 0.173
2048 11.5 0.171
2049 9.4 0.169
2050 7.2 0.167


 
 grafico orbita
Note: Theta is PA, Rho is Sep. For yearly orbits, data refer to Jan 1st.
wds17335%2B5734a.png orbit plot
Measures: green=micrometric, blue=interferometric, purple=photographic